Bought this app this evening, and so far, it's got two REALLY annoying problems with it.
First, it changes all £ to $ signs, regardless of the region settings the iPad is using.
Second, after each word you type in a cell, it changes the keyboard back to numbers. You have to fudge it by doing a small work around.
type a few letters and then press the Font button in the upper right followed by clicking on the X that is in its place, the letter keys stay on. To go back to having it toggle back to numbers, type a number or two and repeat the above font procedure.
Not very impressed so far for a £14 app!